Means for preventing rust in boilers.



A. S. HICKEY.

MEANS FOR PREVENTING RUST IN BOILERS.

- 11121.10111011 FILED 11110.31. 1910.

999,108. Patented July 25, 1911.

I amass ANDREW S. HICKEY, OF THE UNITED STATES NAVY.-

mans FOB ranvnn'rme Boss: in nornnns.

Specification of Letters lat ent. Application filed December 31; 1910. Serial lio. 600,295.

Patented July 25, 1911.

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Be it known that I, ANDREW S'. Hlclgnr, .ensign, of the United States Navy, a cit1zen .of the United States, at resent attached to 5 the U. S. S. Dolphin, ashington, District of -Columbia,have invented certain new and useful Improvements in Means for Preventing Rustin Boilers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to means for pre- --venting rust in boilers, and has for its object to produce a simple and efiicient appara-- tus whlch may be applied. to .those portions of boilers which at present are sub ected to corrosion or rust, and are so inaccessible that it is not at present practicable to place zinc .20 therein by the ordinary methods usually employed.

To these ends the invention consists in the novel details of construction and combinations of arts more fully hereinafter disclosed an particularly pointed out in the claim,

Referring to the accompanying drawings forming a part of this specification in which likenumerals designate like parts in all the views :Figur'e l-is a diagrammatic view of a portion of a boiler with my invention ap-v plied thereto; Fig. 2 is a sectional view on an enlarged scale showing a portion of a boiler shell with my invention in place; Fig.

- 3 is a view of the threaded hollow bolt or enut-like portion of my invention; Fig. 4 is a plan new of the zinc rod detached from the nut-like Fig. 5 is a new of a modified form of the 40 invention.

.1 indicates an outer shell of a boiler, and

'2 the inner shell thereof, said shells forming a narrow and restricted space 3, such as a water leg, while 4'represents the usual stay 46 bolts, which pass through such spaces as 3. In the case of locomotive boilers haying restricted spaces or water legs similar to 3, there is a law, as iswell known, which prohibits any hand holes or man holes through 50 the outer shell that would be available for the placing of zinc in such spaces. It results from this law that the zincs which are actually used in such boilers are placed, at

portionshown in Fig. 3; andsuch great distances from these inaccessible spaces that the protection of said spaces afforded by said zincs is wholly inadequate. The reason for this is apparent when it is considered that the zincs used in boilers are merely one ole of a galvaniccou le of which the boiler shell is the other po e, and that the circuit necessarily follows the path of least resistance, which of course is a path not leading a very great distance from said zinc, In other words, when it comes to inaccesslble spaces such as 3, the resistance to the current is entirely too great for the zinc to afi'ord much protection. It consequently results that boilers of the type above mentioned, do in fact suffer from corrosion or rust very materially in their inaccessible -s aces or water legls. In order to avoid these 0 jections, I tap oles through the shell of the boiler, as indicated, and screw therein the hollow bolt-like nut 5 in which is threaded the zinc rods 6, as shown. The hollow bolt-like nuts 5 being firmly threaded in the shell 1, they can stand just as much pressure as may be put upont-he boiler, and being of, 1" a comparativelyesmall size, they do 110519195}, yond the outer. surface of trude greatly the boiler, and therefore, are not liable to be accidentally detached. Of course, as any of these headed bolts may be employed as is necessary to protect the-space 3, and whenever a zinc rod 6 is eaten up, it is oiily necessary to unscrew the bolt 5 and s pply-it with anew zinc. The zines 6 are pge erably made, about the same size as the stay bolts 4, and thereforetheyma be spaced 1n spaces such as 3', without ta 'ng up" any more room than would extra stay bolts. The threaded connection between the hollow bolt 5 and the shell 1 makes an eiiicieht electrical connec tion, as does also/the threaded connection between the zincy6 and the said hollow bolt other noncorroding metal so that they will always be easy to unscrew for the purpose over said bolt and rod substantially as de-- of replacing the zines 6. scribed. 10 What I claim is In testimony whereof, I afiix my signature An article of manufacture for use in prein presence of two witnesses. 5 venting boilers from rusting, consisting of ANDREW S. HICKEY.

a headed, hollow, threaded bolt adapted to Witnesses: be secured to a boiler shell; :1 headed zinc T. A. THOMSON, Jr.,

rod secured in said bolt; and a cap fitting M. M. LEON. 

